ar71xx: add support for TP-Link TL-WR942N v1

TP-Link TL-WR942N v1 is a 2.4 GHz single-band N450 router, based on
Qualcomm/Atheros QCA9561.

Specification:

- 775/650/258 MHz (CPU/DDR/AHB)
- 128 MB of RAM (DDR2)
- 16 MB of FLASH (SPI NOR)
- 3T3R 2.4 GHz
- 5x 10/100 Mbps Ethernet
- 2x USB 2.0
- 11x LED (most are controlled by 74HC595)
- 2x button
- UART header on PCB*

* Serial console is disabled in OEM non-beta firmwares and corresponding
  GPIO pins 14 and 15 are assigned to control USB1 and USB2 LEDs by
  production (non-beta) U-Boot and firmware.

Currently not working:

1. USB1 and USB2 LEDs if UART RX and TX pins are assigned to their GPIOs
   by some U-Boot versions.

Flash instruction under vendor GUI:

1. Download "lede-ar71xx-generic-tl-wr942n-v1-squashfs-factory.bin".
2. Go to WEB interface and perform usual firmware upgrade.

FLash instruction under U-Boot recovery mode (doesn't work in beta
firmware):

1. Setup PC with static IP "192.168.0.66/24" and tftp server.
2. Change "*-factory" image filename to "WR942v1_recovery.bin" and make
   it available to download from your tftp server.
3. Press "reset" button and power up the router, wait till "WPS" LED
   turns on.

Flash instruction under U-Boot, using UART (can be done only with
preinstalled UART-enabled U-Boot version!):

1. Use "tpl" to stop autobooting and obtain U-Boot CLI access.
2. Setup ip addresses for U-Boot and your tftp server.
3. Issue below commands:
   tftp 0x81000000 lede-ar71xx-generic-tl-wr942n-v1-sysupgrade.bin
   erase 0x9f020000 +$filesize
   cp.b 0x81000000 0x9f020000 $filesize
   reset

Signed-off-by: Serg Studzinskii <serguzhg@gmail.com>
[minor code style fixes, extended commit message]
Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

5 files changed, 17 insertions, 1 deletions

diff --git a/target/linux/ar71xx/base-files/etc/board.d/01_leds b/target/linux/ar71xx/base-files/etc/board.d/01_leds
index 2f9ae8b10e..be6dfcc968 100755
--- a/target/linux/ar71xx/base-files/etc/board.d/01_leds
+++ b/target/linux/ar71xx/base-files/etc/board.d/01_leds
@@ -745,6 +745,16 @@ tl-wr840n-v3)
 	ucidef_set_led_switch "lan" "LAN" "tp-link:green:lan" "switch0" "0x1E"
 	ucidef_set_led_wlan "wlan" "WLAN" "tp-link:green:wlan" "phy0tpt"
 	;;
+tl-wr942n-v1)
+	ucidef_set_led_switch "lan1" "LAN1" "$board:green:lan1" "switch0" "0x04"
+	ucidef_set_led_switch "lan2" "LAN2" "$board:green:lan2" "switch0" "0x08"
+	ucidef_set_led_switch "lan3" "LAN3" "$board:green:lan3" "switch0" "0x10"
+	ucidef_set_led_switch "lan4" "LAN4" "$board:green:lan4" "switch0" "0x02"
+	ucidef_set_led_netdev "wan" "WAN" "$board:green:wan" "eth0"
+	ucidef_set_led_wlan "wlan" "WLAN" "$board:green:wlan" "phy0tpt"
+	ucidef_set_led_usbdev "usb1" "USB1" "$board:green:usb1" "1-1.2"
+	ucidef_set_led_usbdev "usb2" "USB2" "$board:green:usb2" "1-1.1"
+	;;
 tl-wr1043nd|\
 tl-wr1043nd-v2)
 	ucidef_set_led_usbdev "usb" "USB" "tp-link:green:usb" "1-1"
diff --git a/target/linux/ar71xx/base-files/etc/board.d/02_network b/target/linux/ar71xx/base-files/etc/board.d/02_network
index 0dc8bf31a8..b805487977 100755
--- a/target/linux/ar71xx/base-files/etc/board.d/02_network
+++ b/target/linux/ar71xx/base-files/etc/board.d/02_network
@@ -411,7 +411,8 @@ ar71xx_setup_interfaces()
 	tl-mr3420-v2|\
 	tl-wr841n-v8|\
 	tl-wr842n-v2|\
-	tl-wr941nd-v5)
+	tl-wr941nd-v5|\
+	tl-wr942n-v1)
 		ucidef_set_interfaces_lan_wan "eth1.1" "eth0"
 		ucidef_add_switch "switch0" \
 			"0@eth1" "1:lan:4" "2:lan:1" "3:lan:2" "4:lan:3"
diff --git a/target/linux/ar71xx/base-files/etc/diag.sh b/target/linux/ar71xx/base-files/etc/diag.sh
index ae43351c6a..369abde9d4 100644
--- a/target/linux/ar71xx/base-files/etc/diag.sh
+++ b/target/linux/ar71xx/base-files/etc/diag.sh
@@ -36,6 +36,7 @@ get_status_led() {
 	db120|\
 	dr344|\
 	tew-632brp|\
+	tl-wr942n-v1|\
 	wpj344|\
 	zbt-we1526)
 		status_led="$board:green:status"
diff --git a/target/linux/ar71xx/base-files/lib/ar71xx.sh b/target/linux/ar71xx/base-files/lib/ar71xx.sh
index e781c6ee7e..5660d3eaa9 100755
--- a/target/linux/ar71xx/base-files/lib/ar71xx.sh
+++ b/target/linux/ar71xx/base-files/lib/ar71xx.sh
@@ -1166,6 +1166,9 @@ ar71xx_board_detect() {
 	*"TL-WR941ND")
 		name="tl-wr941nd"
 		;;
+	*"TL-WR942N v1")
+		name="tl-wr942n-v1"
+		;;
 	*"Tube2H")
 		name="tube2h"
 		;;
diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index 16701f64ca..e14f8f3e49 100755
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -271,6 +271,7 @@ platform_check_image() {
 	tew-712br|\
 	tew-732br|\
 	tew-823dru|\
+	tl-wr942n-v1|\
 	unifi-outdoor|\
 	unifiac-lite|\
 	unifiac-pro|\